package main

import (
    "encoding/json"
    "fmt"
    "os"
)

type ConfigStruct struct {
    Host              string   `json:"host"`
    Port              int      `json:"port"`
    AnalyticsFile     string   `json:"analytics_file"`
    StaticFileVersion int      `json:"static_file_version"`
    StaticDir         string   `json:"static_dir"`
    TemplatesDir      string   `json:"templates_dir"`
    SerTcpSocketHost  string   `json:"serTcpSocketHost"`
    SerTcpSocketPort  int      `json:"serTcpSocketPort"`
    Fruits            []string `json:"fruits"`
}

type Other struct {
    SerTcpSocketHost string   `json:"serTcpSocketHost"`
    SerTcpSocketPort int      `json:"serTcpSocketPort"`
    Fruits           []string `json:"fruits"`
}

func main() {
    jsonStr := `{"host": "http://localhost:9090","port": 9090,"analytics_file": "","static_file_version": 1,"static_dir": "E:/Project/goTest/src/","templates_dir": "E:/Project/goTest/src/templates/","serTcpSocketHost": ":12340","serTcpSocketPort": 12340,"fruits": ["apple", "peach"]}`

    //json str 转map
    var dat map[string]interface{}
    if err := json.Unmarshal([]byte(jsonStr), &dat); err == nil{
        fmt.Println("==============json str 转map=======================")
    fmt.Println(dat)
    fmt.Println(dat["host"])
}

//json str 转struct
var config ConfigStruct
if err := json.Unmarshal([]byte(jsonStr), &config); err == nil {
fmt.Println("================json str 转struct==")
fmt.Println(config)
fmt.Println(config.Host)
}

//json str 转struct(部份字段)
var part Other
if err := json.Unmarshal([]byte(jsonStr), &part); err == nil {
fmt.Println("================json str 转struct==")
fmt.Println(part)
fmt.Println(part.SerTcpSocketPort)
}

//struct 到json str
if b, err := json.Marshal(config); err == nil {
fmt.Println("================struct 到json str==")
fmt.Println(string(b))
}

//map 到json str
fmt.Println("================map 到json str=====================")
enc := json.NewEncoder(os.Stdout)
enc.Encode(dat)

//array 到 json str
arr := []string{"hello", "apple", "python", "golang", "base", "peach", "pear"}
lang, err := json.Marshal(arr)
if err == nil {
fmt.Println("================array 到 json str==")
fmt.Println(string(lang))
}

//json 到 []string
var wo []string
if err := json.Unmarshal(lang, &wo); err == nil {
fmt.Println("================json 到 []string==")
fmt.Println(wo)
}
}

